One of the questions is: In the following sentence, which words are verbs? Melissa was worried about her job interview.
a. was, worried
b. worried
c. worried, about

I know that it's not c., and I don't think it's a., but I don't know if was is a verb or an adverb, so I don't know. Can someone explain the adverb/verb thing, or, if was isn't an adverb, what type of word it is?